Very nice modeling, as usual with you, superfine precision. And, what a very nice and graphic livery - I must try to build that one some day.
I like that you are using glossy paper - it adds a lot of realism to this elegant aircraft model.

Thank you Federico (by the way, you are my namesake, as my 2nd name is Federico XD).

Here's more to it.

I glue the wings to the airframe. Again, I'm using Tamiya tape to hold the wings while glue does its work.

In the meantime, let's prepare the inferior fairings.

And then in its place in the Concorde belly. The little paper pieces are enforcements for the fairing.

Now I can continue with the details on the rudder, adding the rudder actuators to the stabilizer. By the way, to a plane like this, one can think of the tremendous drag of these little parts, but it's not true. They were designed to work without adding drag, or to a very minimum.

Then the stabilizer goes to the airframe, using a support part for it.